Modern tactical builds demand upper receivers that combine precision, durability, and thoughtful integration. The HM DEFENSE MONOBLOC UPPER RECEIVER delivers a purpose-built platform for operators and serious shooters who prioritize match-grade performance and serviceable design in the field.

HM DEFENSE MONOBLOC UPPER RECEIVER

The MonoBloc Upper features an HM barrel with an integral machined patented gas block and a carbine gas system engineered to balance reliability with controllable recoil impulse. Built from 4150 Chromoly and finished as match grade—tripled honed and button rifled—the barrel is optimized for consistent groups and long-term durability. The upper and lower receivers are 7075-T6 aluminum with a hard coat anodized finish for corrosion resistance and a solid interface with Mil-Spec components.

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Materials and Bolt Design

This upper includes the patented HMB bolt and Mil-Spec internals—components that matter when you need consistent lock-up and reliable extraction under sustained use. The charging handle and dust cover are included; the dust cover features an American Flag for a tactical aesthetic without compromising function. The combination of 4150 Chromoly barrel work and 7075-T6 receiver construction creates a platform designed to handle demanding duty cycles.

Handguard and Accessory Integration

Free-Floating, Modular Mounting

The free-floating handguard is machined from 6061-T6 aluminum and accepts both Picatinny rails and Magpul M-LOK slots for modern accessory mounting. This setup preserves barrel harmonics for accuracy while providing versatile attachment points for optics, lights, and foregrips. Whether you’re configuring a compact carbine or a precision-oriented upper, the handguard layout supports modular builds and aftermarket upgrades.

Available in various configurations to suit mission profile, the MonoBloc is competitively priced at $743.99 for buyers seeking match-grade components and integrated gas-block reliability. View product details and pricing if you want to compare configurations and verify current stock.

Field Use and Applications

For range work, competition, or duty use, the MonoBloc’s match-grade barrel and patented gas block deliver repeatable shot-to-shot performance with predictable gas timing. The robust materials and Mil-Spec parts make it a reliable upgrade for builders who demand a hard-use ready upper receiver. Check current availability and complete fitment notes before purchase to ensure compatibility with your lower and intended setup.

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